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Computing (FOLDOC) dictionary
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unit, humour About 31 mm (one inch). "atto-" is the
standard SI prefix for multiplication by 10^-18. A parsec
(parallax-second) is 3.26 light-years; an attoparsec is thus
3.26 * 10^-18 light years. Thus, one attoparsec per
microfortnight is about one inch per second.